RWHenhouse

Did you take a look under the front of the coach?  Or, locate one of the hydraulic hoses on your generator slide cylinder and follow it back to the pump/manifold.  As always, don't crawl under there without proper blocking to prevent the coach from crushing you if the air suspension fails.
Disregard my last post.  I think your last picture shows the pump manifold, that hex cap is likely the oil fill/check.